<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0256-7024</journal-id>
<journal-title><![CDATA[Revista Geológica de América Central]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Geol. Amér. Central]]></abbrev-journal-title>
<issn>0256-7024</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0256-70242015000200024</article-id>
<article-id pub-id-type="doi">10.15517/rgac.v53i0.21146</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Drenaje ácido de rocas en taludes de la Ruta Nacional 27, San José - Caldera, Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Acid rock drainage on slopes from Route 27 San José - Caldera, Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz]]></surname>
<given-names><![CDATA[Paulo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arauz]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[Jairo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villalobos]]></surname>
<given-names><![CDATA[Giorghi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sedó]]></surname>
<given-names><![CDATA[Ariel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez]]></surname>
<given-names><![CDATA[Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Laboratorio Nacional de Materiales y Modelos Estructurales (LANAMME-UCR) Escuela Centroamericana de Geología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica Escuela Centroamericana de Geología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica Escuela Centroamericana de Geología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Costa Rica Escuela Centroamericana de Geología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de Costa Rica Escuela Centroamericana de Geología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad de Costa Rica Escuela Centroamericana de Geología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CR</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<numero>53</numero>
<fpage>24</fpage>
<lpage>46</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0256-70242015000200024&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0256-70242015000200024&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0256-70242015000200024&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:Este trabajo se enfoca en determinar, mediante análisis de laboratorio de pH en pasta y geoquímica de aguas superficiales, la existencia de drenaje de ácido de rocas (DAR) en dos taludes de la Ruta Nacional 27, Costa Rica. Los resultados de laboratorio (muestras con pH de hasta 1,5), así como las evidencias físicas observadas en el campo, muestran que efectivamente esta carretera presenta DAR en algunos de sus taludes. El DAR en la ruta está afectando directamente las propiedades químicas y físicas del concreto lanzado que se colocó sobre los taludes, el acero electro-soldado y las cunetas para el manejo de aguas superficiales, ocasionando su colapso y generando un peligro para los usuarios. La importancia de identificar este proceso químico y físico que está alterando los materiales de los taludes en los cortes de la carretera, es fundamental para plantear las medidas correctivas adecuadas y resolver el problema, o al menos minimizar los efectos negativos y su influencia en la inestabilidad de taludes de la ruta.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:This study focuses on determinate the presence of acid rock drainage (ARD) on two slopes on Route27, Costa Rica, by analysis of paste pH and geochemistry of superficial water. The laboratory results (samples with pH up to 1.5), and the physical evidence observed in the field, shows that in fact there is ARD in some slopes. The ARD on the route is directly affecting the chemical and physical properties of the shotcrete on the slopes, welded steel and ditch for the surface water management, causing its collapse and creating a hazard for users. The importance of identify this chemical and physical process that is weathering the materials of the slopes in the road cuts, it's essential for the right corrective action and resolve the problem or at least minimize the negative effects and their influence on slope instability of the route.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Acid drainage]]></kwd>
<kwd lng="en"><![CDATA[hydrothermal alteration]]></kwd>
<kwd lng="en"><![CDATA[paste pH]]></kwd>
<kwd lng="en"><![CDATA[geochemistry]]></kwd>
<kwd lng="en"><![CDATA[route 27]]></kwd>
<kwd lng="en"><![CDATA[Caldera]]></kwd>
<kwd lng="es"><![CDATA[Drenaje ácido]]></kwd>
<kwd lng="es"><![CDATA[alteración hidrotermal]]></kwd>
<kwd lng="es"><![CDATA[pH en pasta]]></kwd>
<kwd lng="es"><![CDATA[geoquímica]]></kwd>
<kwd lng="es"><![CDATA[ruta 27]]></kwd>
<kwd lng="es"><![CDATA[Caldera]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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